Carbon dioxide/methanol conversion cycle based on cascade enzymatic reactions supported on superparamagnetic nanoparticles

The conversion of carbon dioxide into important industrial feedstock is a subject of growing interest in modern society. A possible way to achieve this goal is by carrying out the CO2/methanol cascade reaction, allowing the recycle of CO2 using either chemical catalysts or enzymes. Efficient and sel...

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Published inAnais da Academia Brasileira de Ciências Vol. 90; no. 1 suppl 1; pp. 593 - 606
Main Authors MARQUES NETTO, CATERINA G.C., ANDRADE, LEANDRO H., TOMA, HENRIQUE E.
Format Journal Article
LanguageEnglish
Published Brazil Academia Brasileira de Ciências 01.01.2018
Subjects
carbon dioxide
enzymatic catalysis
enzyme cascade-reaction
methanol production
MULTIDISCIPLINARY SCIENCES
superparamagnetic nanoparticles
carbon dioxide
enzyme cascade-reaction
superparamagnetic nanoparticles
methanol production
enzymatic catalysis
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Summary:The conversion of carbon dioxide into important industrial feedstock is a subject of growing interest in modern society. A possible way to achieve this goal is by carrying out the CO2/methanol cascade reaction, allowing the recycle of CO2 using either chemical catalysts or enzymes. Efficient and selective reactions can be performed by enzymes; however, due to their low stability, immobilization protocols are required to improve their performance. The cascade reaction to reduce carbon dioxide into methanol has been explored by the authors, using, sequentially, alcohol dehydrogenase (ADH), formaldehyde dehydrogenase (FalDH), and formate dehydrogenase (FDH), powered by NAD+/NADH and glutamate dehydrogenase (GDH) as the co-enzyme regenerating system. All the enzymes have been immobilized on functionalized magnetite nanoparticles, and their reactions investigated separately in order to establish the best performance conditions. Although the stepwise scheme led to only 2.3% yield of methanol per NADH; in a batch system under CO2 pressure, the combination of the four immobilized enzymes increased the methanol yield by 64 fold. The studies indicated a successful regeneration of NADH in situ, envisaging a real possibility of using immobilized enzymes to perform the cascade CO2-methanol reaction.
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ISSN:0001-3765
1678-2690
1678-2690
DOI:10.1590/0001-3765201720170330